Mazda 4x4 B2500 speedo stoped
 

My 2002 B2500 4x4 pick up speedo as stoped working any idea`s

the mess inside
 

yes I am a mechanic, inside the final drive chain yes it`s a chain` the chain, as gone into bitz, cheap **** jap crap. this truck as had new engine plus head, gearbox rebuilt by nunns in grimsby, would not give them house room, new fan plus rad, new paint job, mazda what a load of crap junk. dont buy them.